The nurse is caring for clients on a medical/surgical unit and determines that several situations need to be addressed. Which of the following situations should the nurse attend to FIRST?

A An angry daughter is threatening to sue the hospital because her confused mother fell out of bed during the previous shift. D The husband of a client reports to the nurse that his wife's nose began bleeding after she returned from radiation therapy. C The physician calls the unit to ask the nurse to obtain a client's latest serum electrolyte results from the lab. B The nursing assistant is 30 minutes overdue from a dinner break in the cafeteria for the third time this week.